| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] use [prep] [adj] | 166 |
|
| 2 | [is] often use [prep] | 86 |
|
| 3 | often use [prep] [adj] | 35 |
|
| 4 | [is] often [prep] [adj] | 16 |
|
